You should stick to your current goal. Don't 'try to' use such cliches-- they must appear reasonably naturally. Idioms and slang both suffer at the early use of non-native speakers, who are not familiar enough with the language or speak it constantly enough that such casual phrases can be dropped in appropriately and without premeditation; more often than not, they are misplaced.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.